--- a/hgext3rd/topic/discovery.py	Thu Oct 18 22:11:43 2018 -0700
+++ b/hgext3rd/topic/discovery.py	Sun Oct 21 00:08:27 2018 +0300
@@ -81,9 +81,11 @@
 
         def revbranchcache(self):
             rbc = super(repocls, self).revbranchcache()
-            changelog = self.changelog
+            localchangelog = self.changelog
 
-            def branchinfo(rev):
+            def branchinfo(rev, changelog=None):
+                if changelog is None:
+                    changelog = localchangelog
                 branch, close = changelog.branchinfo(rev)
                 if rev in publishedset:
                     return branch, close